@gaieus said: Hi Bart, That's the dreaded "clipping issue". See if anything here helps: http://sketchup.google.com/support/bin/answer.py?answer=36261&topic=9042 i see. glad its not just me. i first encountered this issue today. thanx for clarifying.

Hi folks. Another possibility is to use an actual unit as your "unit". For example, draw a line that is 5 cm for a 5 "units" line. Do the whole model and, when done, scale up accordingly. In your example, you would scale up by a factor of 80. Just ideas.

Yes. Go in to the group with the box and motor, then right-click on the box --> SketchyPhysics --> State: ---> then ether "ignore" or "nocollision", it dosn't matter right now. And if you don't want to se the box after this ignore stage, just "hide" it under right-click-menu. /hpnisse PS. More info about ignore and nocollision state: Ignore: http://sketchyphysics.wikia.com/wiki/Ignore Nocollison: http://sketchyphysics.wikia.com/wiki/NoCollision