I'm currently working on the gimble for my new steadycam.
What I do is to document the shortcommings of each version and how I
(at least I try to.)
I'd really like to see more of this to spread the knowledge and enable
more complicated things.
lessons learned so far:
* on a heated bed the fist layer melts a bit and widens. This reduces
the diameter of my vertical holes.
countermeassure: an 0.25mm tapper
* for holes <6mm diameter+0.5mm in diameter is fine for screws.
* +1mm for things that should fit without much friction.
* Holes for 608 bearings should have +1mm in diameter
* they also absolutely should have a 1mm tapper to guide the bearing
into position. (else it will jump out or get stuck at odd angles when
you try to force it into a snug fitting hole)
* have a smaller hole inside the back-wall of the hole, so the inner
part of the bearing has no friction with the back walll and rotates
* supplying a a bill of materials, assembly-instructions and
technical drawing of your thing with the important meassurements
displayed is a very nice thing for *finished* designs. It helps people
build your thing.
* Also don't forget a photo of the real, assembled thing once you are
* a dumb-bell makes an excellent blunt force to insert a 608 bearing.
* rounded or at least tappered edges make any object much more hand-
friendly. A 45° tapper in the vertical is absolutely no problem.
* 27mm is about the maximum you should do vor non-teardrop vertical,
round holes. The overhang works well but you already need the machine
properly calibrated. Machines doing less well will already have
problems with this contruct.
* ALWAYS run the STL your CAD-program generates through netfabb or
something similar to
** align it to the base-plate for printing (I've seen a fair share of
non-aligned STL files and am sick of finding out about the issue after
lengthy Skeinforge-runs only to go back, correct them and wait for
skeinforge again) and
** fix any mesh-errors. (even high priced parametric, volumentric CAD-
systems do sometimes create minor issues in the STL.)