Introduction
OverlapStrap is a 3D printer that I have designed to be made mostly from the same parts as are needed make a reprap mendel. The idea being that I can print the needed 3d parts, with the repstrap, then dismantle the repstrap and build Mendel, without having to have bought lots of extra parts and materials.
Build Instructions
Start by getting your MDF cut into strips of 136mm, 81mm, …
Drilling
Measure the location of the hole as accurately as you can, and mark it with an engineer’s scribe. Then use a punch to make a dent on the peice which will make a nice point on which the drill bit will stay on, and not slide round all over the place. Make sure you use sharp drill bits and if you are using a cordless power drill make sure it is full of juice so that the drill is running fast. You should also consider doing it in two stages. Start with a small pilot followed by a hole of the desired size, this is because smaller drill bits will be easier to keep within the centre punched dent.
Drawing Files
These are the files that I have created so far describing the parts of my OverlapStrap project
Materials
Overlap Materials
| What | Qty Mendel | Qty Strap | Overlap |
|---|---|---|---|
8mm Stud |
9m |
9m |
100% |
8mm Bar |
3m |
3m |
100% |
M8 Nut |
104 |
90 |
86.5% |
Nema 17 |
4 |
5 |
80% |
M4x16mm Cap |
38 |
53 |
72% |
M4x40mm Cap |
115 |
11 |
9.5% |
M3x20mm Cap |
50 |
20 |
40% |
624-Bearing |
48 |
27 |
56% |
Extra Materials
| What | Where | Cost | Qty | Total |
|---|---|---|---|---|
16mm dia PTFE rod 350mm |
ebay: Ringwood Precision Engineering |
£3.50 |
1 |
£3.50 |
1/2"×1/2"×1/8" ALU angle 1000mm |
ebay: Ringwood Precision Engineering |
£1.50 |
3 |
£4.50 |
3/4" Alu square bar 247mm |
ebay: Ringwood Precision Engineering |
£3.65 |
1 |
£3.65 |
Fixing Block (pack of 24) |
B&Q |
£2.98 |
3 |
£8.94 |
6mm×1220×2440 MDF sheet |
B&Q |
£9.14 |
1 |
£9.14 |
Total |
£29.73 |
Tools
| What | Notes |
|---|---|
Vernier Calipers |
|
Engineers Scribe |
Not essential, I used stanley blade as alternate |
Set Square |
|
Tap & Die Set |
M4 and M8 required |
Hacksaw |
I used a mitre saw, which makes square cuts easy |
Power Drill |
|
HSS Drill Bits |
3.3mm 4.0mm |
Git Project
Alternatively the files are available in a git project which you can checkout using the following command
git clone http://www.gilesbathgate.com/OverlapStrap.git
Thingiverse
The design is not currently complete, but when it is I will probably upload it to thingiverse
Copying
Copyright © 2009-2010 Giles Bathgate. OverlapStrap is licensed under the terms of the GPLv3 See: COPYING