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Ctrl+C is normally copy clip (copy to clipboard and is a well known Windows shortcut). It isn't enough to remove that from the keyboard shortcut list you actually have to reassign a new shortcut to the copy clip command and then you are free to use Ctrl+C for something new

You can avoid that problem by using associative hatches. When you create a hatch, make sure the "Associative" box is checked, and use an object instead of a pick point. From then on, the hatch will move whenever the border object moves.

How do you remove materials from objects in Slimlab? One of my materials turned to a round ball when I clicked on it can I put it back to the default trailer hitch looking thing? Haven't understood lighting yet except for sun light, got to learn how to point them. Sometimes I click on a object and it pops up what material is assigned to it other times it's just the name of the object...Haven't figured that out either. Anyways got this far in it: Is there a mirror material? Did you know you can create effects in Slimlab also! Fire, smoke, sparks and showers (?) But it's in the paid version.

Refer to the images in the link posted by dgolchuk above. The student is being asked to create a "pattern" of the transition piece.

https://www.cadtutor.net/forum/topic/30587-hvac-school-project/?do=findComment&comment=245684 check this link out. It may give you a reference to what you’re looking for

Select the 3D Poly, then do Modify -> Explode then select all the lines then (in the properties window) set "Start Z" to 0.00 (that is zero) also set "End Z" to 0.00 finally select all the lines then do Modify -> Join

Something like this perhaps? (defun c:req ( / ent enx ) (while (progn (setvar 'errno 0) (setq ent (car (entsel))) (cond ( (= 7 (getvar 'errno)) (princ "\nMissed, try again.") ) ( (null ent) nil) ( (not (wcmatch (cdr (assoc 0 (setq enx (entget ent)))) "TEXT,MTEXT")) (princ "\nPlease select a text or mtext object.") ) ( (entmod (subst '(1 . "REQUIRED") (assoc 1 enx) enx))) ) ) ) (princ) )