Prism
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Release status: Working
Description | Mendel Frame
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License | unknown
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Author | |
Contributors | |
Based-on | |
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CAD Models | |
External Link |
This extruded aluminum frame is a quick upgrade to your standard Sells Mendel. It makes it cleaner, more open and, more importantly, more rigid.
You can start printing parts today, but wait to order parts 'till next week while I finalize a screw/nut count. If you just can't wait. know that I've used less than 100 screws/t-nuts for my build, but over 100 M4 washers.
The only part I don't have designed yet is a mount for the endstops. You can use the endstop holder designed for Prusa, or run without endstops while i design one for 20x20 mounting, or design one yourself and put it up here or on thingiverse.
Contents
New non-printed parts
(Misumi parts numbers are listed, where applicable, for easy ordering)
- Extruded Aluminum Profile
- 20x20x400 - 9 (HFS5-2020-400)
- M3
- M3x10mm SHCS - ~10-20
- M3x15mm SHCS - 2
- M3 Nut - ~10
- M3 washers - 2
- M4
- M4x12mm SHCS - ~70
- M4x20mm SHCS - 16
- M4 T-Nuts (which are compatible with your extrusion) - ~70 (HNKK5-4)
- M4 washer - ~140
- NOT REQUIRED M4 Post-Assembly T-Nut - 20 will run about $10 - makes it easy to attach parts without having to disassemble the whole frame. (HNTA5-4)
Printed Parts
Files
Up-to-date files will be on github: https://github.com/Buback/Prism-Reprap
Images
Optional pieces:
Build Instructions Notes
The Thick 90 degree part is mainly just to raise the printer up high enough so the z rods and motor shaft don't hit the table/workbench your printer is upon. You can use the thin part for all the vertexes but you're going to need to print out the spacer in order to get the proper height. The spacer/thin parts use much less plastic and print faster, but might not be as rigid --Buback 18:24, 27 December 2011 (UTC)
Visual Assembly Guide
I removed my old instructions, as I think the pictures bellow are clearer, but i'll add detailed instructions over the next couple weeks --Buback 17:58, 28 December 2011 (UTC)
Further Development
-There isn't room at the top of the z rods to get a tool in and tighten the screws, which is why you need to put in the z rod first. I'm not pleased with this, and so the first order of business is to figure out a way to fix this. Adding longer 'arms' to the Ztop piece is the obvious solution, but then it's a longer unsupported angled print, which i feel leads to week parts. the other option is to split the part down the middle and make it two parts. the problem here is alignment becomes a bit of an issue, potentially. Anyway, if you'd like to design a part that holds a 8mm (or larger) rod in between two 20x20mm extrusions at a 60deg angle, feel free to post it here.
-Perhaps a dedicated Y and x carriage would be nice. I prefer a vertical X and ball bushings. The X build area could also be made bigger, but is now limited by the x length of the x carriage, and not by the space between the angled bars.
-Fully Parametric parts, a la OpenSCAD.