The other day I was looking at the quick-fit clamp in AOI. I wanted to see how I could modify it to grip the PTFE barrel better. I wanted to make sure whatever I came up with didn't violate the >45 overhang rule. That's when I realized it already has overhangs. There are 3 horizontal holes without the 45-degree peaks, a beveled edge that creates a 60-degree overhang and dome-shaped indentations on the sides and bottom. I'm pretty sure this part can't be printed on a single-head RepRap / RepStrap without modification. This morning, I went through the STL files for Darwin 1.0.2 and thermoplast extruder 1.0 to see how many overhangs I could find. I found 24 parts that probably can't be printed as-is without support material. Now, I just eyeballed these, looking for anything that didn't seem quite right. I could be completely wrong. Here's the list: reprap-thermoplast-extruder-1.0 ---------------------------- clamp.stl - 3 horizontal holes offset-motor-holder.stl - 6 horizontal holes plus logo poly-holder.stl - 4 horizontal holes plus logo quickfit-clamp.stl - 3 horizontal holes, >45 overhang on bevel, overhang on indentations screw-holder.stl - 4 horizontal holes plus logo reprap-cartesian-bot-1.0.2 ----------------------- Bed-corner.stl - 2 horizontal holes plus horizontal overhang Circlip-M8.stl - >45 overhang on bevel Corner-bracket.stl - >45 overhang on rounded corner Diagonal-tie-bracket.stl - 1 horizontal hole plus >45 overhang on rounded corner Extruder-quickfit-dock.STL - horizontal overhangs in all orientations Extruder-quickfit-latch.STL - horizontal overhangs in all orientations Fan-leg.stl - 1 horizontal hole Optoswitch-bracket.stl - 1 horizontal hole X-carriage.STL - 1 horizontal overhang X-idler-bracket.stl - 1 horizontal hole plus >45 overhang on rounded corner X-motor-bracket.stl - horizontal overhang X-opto-flag.stl - >45 overhang on rounded corner X-square-jig.stl - >45 overhang on rounded corner XY-pulley-idler.stl - >45 overhang on bevel Y-motor-bracket.stl - horizontal overhangs in all orientations Y-motor-coupling.stl - 2 horizontal holes plus horizontal overhang Z-motor-bracket.stl - 2 horizontal overhangs Z-motor-coupling.stl - 3 horizontal overhangs Z-opto-flag-base.stl - 1 horizontal hole https://reprap.org/forum/read.php?1,8125,8125#msg-8125 Wed, 20 May 2026 06:06:21 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,8125,23103#msg-23103 https://reprap.org/forum/read.php?1,8125,23103#msg-23103 reece.arnott General Fri, 24 Apr 2009 05:08:35 -0400 https://reprap.org/forum/read.php?1,8125,23046#msg-23046 https://reprap.org/forum/read.php?1,8125,23046#msg-23046 i would like to know how many parts are available in new Zealand .
regards john Morgan]]> john morgan General Wed, 22 Apr 2009 00:37:21 -0400 https://reprap.org/forum/read.php?1,8125,8630#msg-8630 https://reprap.org/forum/read.php?1,8125,8630#msg-8630 [www.blogger.com]

Also forrest said HDPE and HPP both do that as well.

So could a truncated teardrop cylinder be made? The top of the cylinder would be made by spanning the top gap, getting around the 45 degree overhang limit for the small space. The truncated cylinder would give more support than a teardrop cylinder, although still less than a completely round cylinder.

Does anyone with a fabricator want to try making a test truncated teardrop?]]> Enrique General Fri, 18 Jan 2008 22:16:14 -0500 https://reprap.org/forum/read.php?1,8125,8481#msg-8481 https://reprap.org/forum/read.php?1,8125,8481#msg-8481 [www.reprap.org]]]> degroof General Tue, 15 Jan 2008 12:41:55 -0500 https://reprap.org/forum/read.php?1,8125,8207#msg-8207 https://reprap.org/forum/read.php?1,8125,8207#msg-8207
I'm fairly confident that the parts can be re-engineered to print without support materials. I've fixed the opto bracket, X motor bracket and XY idler already.

Vik :v)]]> vik General Tue, 08 Jan 2008 18:02:05 -0500 https://reprap.org/forum/read.php?1,8125,8206#msg-8206 https://reprap.org/forum/read.php?1,8125,8206#msg-8206
Demented]]> Demented Chihuahua General Tue, 08 Jan 2008 17:12:33 -0500 https://reprap.org/forum/read.php?1,8125,8175#msg-8175 https://reprap.org/forum/read.php?1,8125,8175#msg-8175 nophead General Mon, 07 Jan 2008 14:04:05 -0500 https://reprap.org/forum/read.php?1,8125,8174#msg-8174 https://reprap.org/forum/read.php?1,8125,8174#msg-8174
Or, at the very least, it'd be handy if a minimal, one-head system can produce its own paste extruder. That would give new owners a practical first project.]]> degroof General Mon, 07 Jan 2008 13:52:42 -0500 https://reprap.org/forum/read.php?1,8125,8161#msg-8161 https://reprap.org/forum/read.php?1,8125,8161#msg-8161 blog.reprap.org]

I don't know of anybody else who has one. Personally I am waiting to see if the support works before attempting to build one. I can't imagine it working for HDPE either, so not much use until CAPA becomes available.

Perhaps a lot of parts could be modified with tear shaped holes, etc, to make it self replicate without support but then that would be self replication for the sake of it. I don't think an FDM machine without support is very useful. Most practical objects you would want to make need support.

It may be possible to use the same material for support and build. Some commercial machines use ABS for both. The support is grey so you can see which bits to remove but I don't know if it has any other difference. I guess they control the shape and temperature to make a temporary weld that you can snap it off easily. It was on my huge list of things to try with HDPE before my extruder expired.]]> nophead General Mon, 07 Jan 2008 08:34:09 -0500 https://reprap.org/forum/read.php?1,8125,8156#msg-8156 https://reprap.org/forum/read.php?1,8125,8156#msg-8156
Just observing photos on blogs and the forum... does anyone outside of Bath have a RepRap with support material extruder assembly?]]> RoundSparrow General Mon, 07 Jan 2008 08:03:31 -0500 https://reprap.org/forum/read.php?1,8125,8126#msg-8126 https://reprap.org/forum/read.php?1,8125,8126#msg-8126 nophead General Sun, 06 Jan 2008 13:04:59 -0500 https://reprap.org/forum/read.php?1,8125,8125#msg-8125 https://reprap.org/forum/read.php?1,8125,8125#msg-8125
This morning, I went through the STL files for Darwin 1.0.2 and thermoplast extruder 1.0 to see how many overhangs I could find. I found 24 parts that probably can't be printed as-is without support material. Now, I just eyeballed these, looking for anything that didn't seem quite right. I could be completely wrong.

Here's the list:

reprap-thermoplast-extruder-1.0
----------------------------
clamp.stl - 3 horizontal holes
offset-motor-holder.stl - 6 horizontal holes plus logo
poly-holder.stl - 4 horizontal holes plus logo
quickfit-clamp.stl - 3 horizontal holes, >45 overhang on bevel, overhang on indentations
screw-holder.stl - 4 horizontal holes plus logo


reprap-cartesian-bot-1.0.2
-----------------------
Bed-corner.stl - 2 horizontal holes plus horizontal overhang
Circlip-M8.stl - >45 overhang on bevel
Corner-bracket.stl - >45 overhang on rounded corner
Diagonal-tie-bracket.stl - 1 horizontal hole plus >45 overhang on rounded corner
Extruder-quickfit-dock.STL - horizontal overhangs in all orientations
Extruder-quickfit-latch.STL - horizontal overhangs in all orientations
Fan-leg.stl - 1 horizontal hole
Optoswitch-bracket.stl - 1 horizontal hole
X-carriage.STL - 1 horizontal overhang
X-idler-bracket.stl - 1 horizontal hole plus >45 overhang on rounded corner
X-motor-bracket.stl - horizontal overhang
X-opto-flag.stl - >45 overhang on rounded corner
X-square-jig.stl - >45 overhang on rounded corner
XY-pulley-idler.stl - >45 overhang on bevel
Y-motor-bracket.stl - horizontal overhangs in all orientations
Y-motor-coupling.stl - 2 horizontal holes plus horizontal overhang
Z-motor-bracket.stl - 2 horizontal overhangs
Z-motor-coupling.stl - 3 horizontal overhangs
Z-opto-flag-base.stl - 1 horizontal hole]]> degroof General Sun, 06 Jan 2008 12:18:31 -0500