LittleRP2 Information

Forum dedicated to discussion and technical support centered around the LittleRP affordable, open source 3D resin printer.
dovoto
Posts: 3
Joined: Tue Mar 14, 2017 11:37 pm

Re: LittleRP2 Information

Postby dovoto » Wed Mar 15, 2017 4:38 pm

goopyplastic wrote:The LittleRP1 didn't have holes for the X152H, you could print out the dxf for the new base from github and overlay and drill the new holes. One tricky thing with the X152H is that it needs a little extra height depending on which set of holes you use. The front set of holes you need an extra 1 layer of mdf, you would use the square base in this scenario the standard M5x16 for the base will hold in this scenario. If you use the rear set of holes, you will need 3 layers of mdf, so the square base plus 8 disc spacers. The LittleRP2 comes with 8 disc spacers and extra length M5 screws for this. However I imagine most people will be using for the forward set of holes on the X152H as they are going for maximum detail.


Yeah, I know how to fix it but "it works" as is so haven't found the proper motivation and I've sort of been waiting for the new design before I put much work in to making it final. Doing it properly would probably get me a bit more consistency though.

goopyplastic wrote:The printer gets really large if you do an underslung projector, the LittleRP was meant to be placed on a desk ... you would end up with something as big as a muve3d or b9 .


Interesting...I actually cant put it on my desk because its much too wide where as if it were just tall I could (or could set it next to the desk)...was just curious as that did seem to add complexity....if desk geometry is the reason I may just redesign the base to my liking (probably on a drawer slide with two positions).

Thanks for the quick answers!

goopyplastic
Posts: 230
Joined: Sat Mar 29, 2014 6:16 pm

Re: LittleRP2 Information

Postby goopyplastic » Fri Mar 17, 2017 2:30 pm

I posted the printers up for pre-order in the web store, limited number of kits so if you are interested in a full kit now's your chance. EBA and upgrades will follow after I get the kits shipped out.

Scatterplot
Posts: 119
Joined: Mon Jan 12, 2015 12:09 pm

Re: LittleRP2 Information

Postby Scatterplot » Fri Mar 17, 2017 5:33 pm

Hey very cool! Add me to the list of people wanting upgrade parts. Specifically the vat/build plate stuff and mirror. I have my own laser and can do the laser parts (and probably the T-slot extrusions and hardware).

Congrats on getting it all put up!

RedBeard
Posts: 11
Joined: Tue Feb 28, 2017 9:51 pm

Re: LittleRP2 Information

Postby RedBeard » Fri Mar 17, 2017 7:28 pm

:D :D When do you expect to have the kits shipped; not that I would be interested in the kit going to Pittsburgh... 8-)

educa
Posts: 16
Joined: Tue Jun 09, 2015 6:39 am

Re: LittleRP2 Information

Postby educa » Sat Mar 18, 2017 6:33 am

Just a little question

you mention both Acer X152H and the Optoma HD37 to be good for 25 micron, but when I look at the list of projectors you mention, almost none of them can still be bought. They are all out of stock old products. Is there any fullHD 1920x1080 projector which is good and buyable for this ?

goopyplastic
Posts: 230
Joined: Sat Mar 29, 2014 6:16 pm

Re: LittleRP2 Information

Postby goopyplastic » Sat Mar 18, 2017 1:25 pm

educa wrote:Just a little question

you mention both Acer X152H and the Optoma HD37 to be good for 25 micron, but when I look at the list of projectors you mention, almost none of them can still be bought. They are all out of stock old products. Is there any fullHD 1920x1080 projector which is good and buyable for this ?


Amazon has the X152H for $535 and it is an active product, the HD37 is the currently recommended projector for the Solus and is available as well. Other projectors will likely work, but there is a financial limit to the number I can buy and test myself. They may be less common than others. In general using diopters vs. shimming will give you a higher x/y micron resolution so that is always an option, the downside is that you start to introduce barrel distortion.

minimaker
Posts: 72
Joined: Sat Apr 18, 2015 10:54 am

Re: LittleRP2 Information

Postby minimaker » Sat Mar 18, 2017 1:29 pm

Ok, this is a nice update of the design. I'm about to start experimenting with the Littlerp again (need to get a mask defined but didn't have the time for that).

About the Acer X152H and the Optoma HD37. Can they be used without any modifications to the beamers themselves?
Let's see what we can do with a LittleRP.

cooly
Posts: 61
Joined: Sat May 28, 2016 7:54 am

Re: LittleRP2 Information

Postby cooly » Sun Mar 19, 2017 7:54 am

minimaker wrote:Ok, this is a nice update of the design. I'm about to start experimenting with the Littlerp again (need to get a mask defined but didn't have the time for that).

About the Acer X152H and the Optoma HD37. Can they be used without any modifications to the beamers themselves?


I've also developed my commercial printer using Optoma HD37 and it requires 10x macro lens to obtain 25microns xy. I have no idea about acer x152h, but doubt there is any projector that can project those small areas without macro lenses.

cerriousdesign
Posts: 57
Joined: Wed Nov 26, 2014 8:19 pm

Re: LittleRP2 Information

Postby cerriousdesign » Sun Mar 19, 2017 10:30 pm

At the Little RP2 info page, it says that the Acer H6510BD may have focus issues. What is that about?? I have been using this projector quite reliably since I got the LRP1 from the Kickstarter promotion. This projector won't work with Little RP2. So we have to buy a whole new projector if we want to get LRP2?

goopyplastic
Posts: 230
Joined: Sat Mar 29, 2014 6:16 pm

Re: LittleRP2 Information

Postby goopyplastic » Sun Mar 19, 2017 10:38 pm

cooly wrote:I've also developed my commercial printer using Optoma HD37 and it requires 10x macro lens to obtain 25microns xy. I have no idea about acer x152h, but doubt there is any projector that can project those small areas without macro lenses.


The x152h will do it shimmed with (2) m3 nuts which off the top of my head is around 4.5mm. It has a hint of keystoning but nothing like the barrel distortion that the diopters do especially +10. The hd37 isn't practical to shim due to the lense shift assembly. The littlerp in small projection mode can't really have a shorter optical path and still use a mirror, so it's likely you couldn't get 25 micron with the x152h shimmed in a design that uses a larger mirror. For example im guessing the solus and mono probably have a larger mirror to support different build sizes, this would likely prevent you from getting a shimmed x152h close enough. Diopters will give you the longer throw but at the cost of some fairly noticeable barreling.