There is a slew of projectors out there And I am sure that you will find one the fits your budget size,and likes. There is also a lot of controversy about projectors its bulbs etc….

Lets start by just looking at a few different types of projectors that might work for 3d printing.

1-Digital Light projectors.



2-Light Spectrum charts for DLP’s

CS-1 Host Software Win32 EXE!

Ok… it’s finally here… a self-contained EXE file for our current CS1 Host software.

You can download it here: CS1 Host Software for Windows 32 bit

I’m adding these download links to the sidebar as well, for easy access. New versions will replace old ones, so to download a newer version, just use the same link!

Download, play with it and let us known how it goes… Keep in mind this is just a pre-release for distribution test purposes, so don’t expect it to be functional yet!


CS-1 Host Software OSX app!

I finally got it! An self-contained app for OSX of our host software!

Just uncompress it, and double click!

download it here!

Windows EXE file coming next!! ūüėČ

Realtime Slicer proof of concept using GPU

It’s being a while since my last update on our software, but I got some exciting progress to report at least…

Images are better than any description, so check it out for yourself:


This video shows my first successful test on slicing a model in realtime using GPU shaders!

I’m cleaning up my code right now and you should be find the first public version of the CS1 host software on our github by today afternoon!

or you can download a “zipball” of it directly by clicking here

I invite everyone to download it and give it a try! I really wan’t to known how the GPU code will behave in different computers with different setups, to see how feasible it will be to rely on GPU for our base software. From what I known, GPU shaders is something very common on hardware these days, and it has being for a few years now, so I’m hopping you guys computer setup already have a reasonable good video board that will support GPU shaders. Maybe not as fast as a computer game would need, but fast enough to slice and display slices in realtime. But to confirm that, I need you guys to test the software asap!

To download the software, theres a big “DOWNLOAD” button on the github page. Download it as “.zip”. After uncompress it, go to “host” software, and if running Windows, just double click on:

“Click here to run Chemshapes Host Software.cmd”

and it should launch it.

If you find any issues, bugs or suggestions, please report it on this page:

The host software can read booth .obj or .stl files… please try it out and let me known!

The viewport camera has some issues, like not automatically adjusting the frustum and clipping planes when loading new geo, so keep in mind that you may have to zoom in/out to see a model you just load, in case it won’t show up automatically!

Apart from the slicing demo, the communication with the electronics also works, and it connects successfully with  the reprap Sprinter firmware, and should connect fine with any other reprap/gcode compatible firmware over serial port.

If your electronics is arduino based, I strongly recommend you to install our fork of the Sprinter firmware, found at:

have fun!!

CS-1 PCB’s and schematics

This page was last updated on Jun 18, 2012 

Eagle Cad files of the CS-1Top copper trace trace layout (Done in EAGLE CAD) below:
Bottom copper trace trace layout (Done in EAGLE CAD) below: 





Populated view below:


CS-1  Assembly manuals:

Main Cs-1 Assembly manual here:

 Chemshield_assmbly_ instructions.


 CS-1 30 way Ribbon Cable  Assembly here:



¬†CS-1 Opto Interrupt PCB’s assembly manual here:





CS-1 PIN LAYOUTS_Apr8_2012

Mach3 macro for controlling Powerpoint

Here is the latest version of the macro that allows Mach3 to open Powerpoint, display your individual slices/slides and move your Z axis into position for each build layer. This solution is only good for slice files that are bitmap files or any format that can be loaded into Powerpoint.

To setup the slides show:

Open PPT and insert a new photo album. Load your slice files. Note: for some reason, when PPT loads a series of images, it puts the last file at the top of the list then continues the order properly. For example. if you have 100 images in your sequence, your order will look like this:

and so on…….

Fig1_A Don’t know why PPT does this but it’s annoying. The first solution would be to select image_100.png and move it down to the end of the list (in the PPT dialog) This could be a pain if you have to move it down, one click at a time, to the bottom of the list.

The easy solution is to go into the folder that contains your slice files, duplicate the last image and rename it image_101.png. Then when you import your slides, you just delete image_101.png, which will be at the top of the list. The rest will be in numerical order.

Fig2_B Under album layout, set picture layout to 1 picture. This will center the images and keep them aligned.

Click create. You will see that the first slide is blank and that’s fine, do not delete this slide. Now just set the background to “black” for all slides. Save as a .pps file not .ppt

Here is the macro for Mach3:

[sourcecode language=”vb”]

Option Explicit

‘Change the constant values below to suit – make sure your Powerpoint file is .pps
Const ppFileName As String = "C:\My Documents\my slideshow.pps"
Const ZStartPoint As Double = 0.0 ‘where Z starts from

Dim numSlides As Integer
Dim exposureTime As Integer
Dim ZIncrement As Double
Dim s As Integer

‘ User inputs for variables

NumSlides = 15
exposureTime = 8000 ‘ in ms
ZIncrement = .005

Dim objPPT
Dim objPresentation

Set objPPT = CreateObject("PowerPoint.Application")

objPPT.Visible = True ‘ set to display on top

Set objPresentation = objPPT.Presentations.Open(ppFileName)

Code "G90" ‘absolute distance mode

Code "G0 Z" & ZStartPoint ‘start Z at wherever
While IsMoving()
sleep 10

Code "G91" ‘incremental distance mode

SetFeedRate(5/60) ‘ feedrate 5 inches/minute set as appropriate

For s=1 To numSlides

objPresentation.SlideShowWindow.View.GotoSlide (s) ‘show the next slide

sleep exposureTime

objPresentation.SlideShowWindow.View.GotoSlide (1) ‘ show slide 1¬† blank slide

Code "G1 Z" & ZIncrement + ZIncrement + ZIncrement + ZIncrement + ZIncrement + ZIncrement + ZIncrement + ZIncrement ‘lift Z a couple of tads
Code "G4 P1"
While IsMoving()
sleep 10

Code "G1 Z-" & ZIncrement + ZIncrement + ZIncrement + ZIncrement + ZIncrement + ZIncrement + ZIncrement ‘lower Z a tad
While IsMoving()
sleep 10

Sleep 1000 ‘ this value adds a delay before the next slide is displayed


Code "G90" ‘back to absolute distance mode




Copy this text (using the icons that show up when the mouse is over the code) and save as M800.m1s
put it in your Mach3 macros folder (in the profile you are using) then type M800 on the MDI screen. That’s it, You can now adjust the parameters in the macro to suit your machine and resin mixture. Let the experiments begin!

This has been tested successfully with Powerpoint 2003

Thanks to John T for the macro mods! This macro is fully functional but we still want to add more features, I will post updates as they get completed.


CSR-1 ,UV Rapid shot modeling

The CSR-1¬† is only in conceptual stage and pretty much a hypothesis for now. The concept¬†¬†¬†carries a lot of merrit and¬† hold it’s own category because nothing like this has ever been attempt or build before. ChemShapes¬†is the only company that we know of that is in development of ¬†this¬†technology .It is called the¬† “RAPIDSHOT” This method is truly¬†unique and will¬†put ChemShapes on the forefront¬†of rapid prototype technology. It will be called¬†the (CemShapes Rapidshot)¬†,¬†¬†¬†CSR-1 Model.¬†¬† The CRS-1¬† will do a one time¬† 8 to 20 seconds cure for for¬† a 1 cubic foot model. then just like the CS-1¬†post curing.

What is it?

more coming soon.

UV cured modeling

Last updated JUL 14, 2011

This is a very controversial subject defended by a lot of  purists. Here is our take on it.

For most application the Ultra Violet or visible light curing¬† method is by far superior and much faster to any other rapid modeling methods. The name 3d-printing is actually a misnomer. a Better¬† title for it is ”¬†Layered UV cured¬†modeling” . Even¬†though this method uses resin for every layer buildup it is not mechanically applied¬†at every layered ¬†level. Becaus it is a liquid at low viscosity ,it uses gravity to fill the building¬† gap for the next layer of curing. For that reason we do not categorize it as deposition modeling . It has great resolution , and uses ¬†minimal moving parts.

Fig. 1. The basic concept of UV light curing,1-Stage (building platform),2-The model being build,3-The Vat containing the resin,4-horizontal beam,6-Main Z-Axis collumn,7-Stepper motor,8-Carriage plate,10-Base,11-Projection beam

So what is a rapid prototype  modeling by light projection  and how does it work?

The purpose of it is to rapidly ( a few hours)fabricate/grow¬† an exact replica¬†of a 3 dimensional computer¬†aided design drawing(CAD). It is normally a¬†conceptual or working ¬†model¬†for the¬†industry. Scientists¬†,architects,dentist¬†,jewelelers¬†etc. make very good use of it and for the first time this will now be available to the hobbiest,the¬†D.I.Y’s¬† and tinkerers . Any type of model can be build with it with no limitations to undercuts ,hollow structures or curvature. It builds a model in¬†a 3 dimensional¬†¬†hard durable ¬†solid¬†layered¬† format in resin ,rubber or wax. (now other materials also became available).¬†The model is build upside down with the base attached to the hatced blue platform.

The software interface (see link below) starts  the process by slicing a 3d CAD drawing into thousands of horizontal sliced layers and generate a photo image for each  cross section in a seqential order. For example if the model was a sphere ,the images would start as a small tiny round white dot on the bottom and grow sequentially bigger per layer until it gets to the center  slice(the biggest) .Then it will get smaller again (per layer) as it goes to the top of the sphere. . The last sliced image wil be small again.  Each image is used to seqentially build  a one layered cross section at a time. Each layer is formed by hardening  a layer of resin by the printer  as decribed below:

Refer to the above illustration Fig. #1 : A Light curing resin¬† (usually Ultra violet(UV)¬† sensitive) is poured into a shallow¬† square¬†vat/container (shown in blue color).The bottom of the vat is made of clear glass¬†.¬† A building platform¬† (Yellow) is lowered into the liquid resin until it almost touches the bottom glass (hairline space above). A projector projects the first image sliced (cross section #1)¬† of the 3d CAD¬†drawing¬†in white light (or uv) through the glass onto the¬†building platform surface for about 8 seconds. As the thin sandwiched layer¬†of resin between between the glass and the building surface¬†recieves ¬†the light, it cures to a plastic consistency(polymerize). This first layer is¬†importand ,It forms the base of our model wich is now glued to the building platform surface. The printer ¬†stops projecting and¬†¬†let the computer know to move the¬†platform¬†up another hair thickness (0.01mm) .The printer calls for the next image and projects the next layered image.The process repeats itself over many thousands of times with a new image every time……..¬†Layer after layer the model is build up ( like a thick stack of paper) ¬†to form the¬†solid model.

This process continous until the whole model (green) is extruded from the resin vat.The model is build upside down, as it extrudes from the base first.

A highly  detailed model (high resolution) of 2 inches high (50mm) usually consist of thousands of layers. Needless to say that the whole process is  computer controlled and can take up many hours to build a small 2 inch model.



Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, in the range 10 nm to 400 nm.

There are three types  of Ultra-violet light :
UV-A : With wavelength 400-320 nm is less intense than UV-B, but is more penetrating  to the eye reach and damage the retina easily

UV-B : Wavelength 320-286 burns the skin   and damages the cornea and ocular lenses.Half of it does not go through window glass as far as I read and researched.

UV-C : filtered off by ozone layer

Here is the a the lightwave  spectrum ,we are going to focus on the Ultraviolet


The Electromagnetic VISISBLE LIGHT Spectrum

Fig. 1 The Electromagnetic spectrum


Other links:


2-….Here….. is a good link if you want to dig really deep in the definitions.

Companies that does RP modeling




Rapid prototyping by deposition

We will include all other deposition methods on this page. Almost  all rapid prototype method includes the depositing or build up  of  a material added in a layered buildup of some sort. The most comon ones are:

1-…3-Dimensional Inkjet Printing (mostly pure wax buildup),

2-Fused Deposition (mostly extruded waxes, glue and plastics)…In this method the one layer gets fused by heat to the next layer by a microscopic plastic, glue or wax ¬†extrusion from a round or square nozzle.

3-Laminated modeling  by  layering (mosty paper layering)

4 -Laser Sintering (layered powder,mostly metal, deposition bonded by a micro laser ). 

5-Jet printed resin on layered Powder¬† deposition…..Even though this process is very similar to laser sintering(without the laser) ¬†we will categorize it by its own .It uses a curing resin printed printed on top a layered ¬†powder buildup. Big advantage of this method I can be done in colors.

UV web links

Last updated MAY 16, 2012



1-Prof .Nicholas Fang





Chemistry and suppliers  links:

UV Resins,waxes ,epoxies,rubbers and ink:





















UV  Inhibitors/absorber/blockers/stabilizers:






UV Patents:




Beakers, graduated cylinders,pipets, scales etc.




Links of similar interest :