Tear Drop Holes. What is the significance of the "Tear" shaped wholes in some parts? https://reprap.org/forum/read.php?1,45950,45950#msg-45950 Fri, 17 Jul 2026 07:15:43 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,45950,46020#msg-46020 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,46020#msg-46020 nophead General Thu, 20 May 2010 08:16:12 -0400 https://reprap.org/forum/read.php?1,45950,46014#msg-46014 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,46014#msg-46014
You can also truncate the top of the hole so you dont get the sharp stress raiser pointed form. I normally go up at 60 degrees not 45 and then truncate the top so that the theoretical diameter touches horizontal.

Perhaps if this is adopted you could ask Adrian to change the logo!]]> martinprice2004 General Thu, 20 May 2010 07:06:34 -0400 https://reprap.org/forum/read.php?1,45950,46012#msg-46012 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,46012#msg-46012
Don't tell that to the guy who has to design something and input them into 3D modelling software. I guess once you have one it might not be too bad to copy and alter.]]> KeithSloan General Thu, 20 May 2010 06:42:19 -0400 https://reprap.org/forum/read.php?1,45950,46006#msg-46006 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,46006#msg-46006 Markus Amsler General Thu, 20 May 2010 03:54:56 -0400 https://reprap.org/forum/read.php?1,45950,46004#msg-46004 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,46004#msg-46004 The RepRap Logo

Adrian Bowyer came up with the name RepRap, and Ed Sells came up with the logo. The teardrop shape is the profile of a cylinder with 45o angles above. Our commercial FDM machine can make a 45o overhang without support material, so - if you want a horizontal hole to put a cylinder through - the teardrop profile gets made without support. This is both faster and neater. And for the vast majority of cases it doesn't matter that it is not completely round.

The teardrop is also an important example of the fact that, with this technology, complexity of shape costs nothing.]]> rhmorrison General Thu, 20 May 2010 02:39:20 -0400 https://reprap.org/forum/read.php?1,45950,46002#msg-46002 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,46002#msg-46002 -------------------------------------------------------
> which came first, the logo or the hole?

Almost certainly the hole as its required to print horizontal holes.
The logo was probably inspired by seeing one.]]> KeithSloan General Thu, 20 May 2010 02:28:57 -0400 https://reprap.org/forum/read.php?1,45950,46001#msg-46001 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,46001#msg-46001 hintss General Thu, 20 May 2010 02:16:51 -0400 https://reprap.org/forum/read.php?1,45950,45969#msg-45969 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,45969#msg-45969 AngelaE8654 General Wed, 19 May 2010 14:44:23 -0400 https://reprap.org/forum/read.php?1,45950,45958#msg-45958 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,45958#msg-45958 tesla893 General Wed, 19 May 2010 11:09:33 -0400 https://reprap.org/forum/read.php?1,45950,45956#msg-45956 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,45956#msg-45956
]]> Nudel General Wed, 19 May 2010 10:43:53 -0400 https://reprap.org/forum/read.php?1,45950,45952#msg-45952 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,45952#msg-45952 -------------------------------------------------------
> The top of a horizontal hole has no support.
> Putting a "roof" on the hole reduces the maximum
> overhang angle to 45 degrees.

Thanks. So its an issue of ability of part to be printed, rather than being required for Mendel construction. i.e. When inserting rods etc.]]> KeithSloan General Wed, 19 May 2010 10:27:57 -0400 https://reprap.org/forum/read.php?1,45950,45951#msg-45951 Re: Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,45951#msg-45951 JohnWasser General Wed, 19 May 2010 10:21:12 -0400 https://reprap.org/forum/read.php?1,45950,45950#msg-45950 Tear Drop Holes. https://reprap.org/forum/read.php?1,45950,45950#msg-45950 KeithSloan General Wed, 19 May 2010 10:14:56 -0400