translate(\[10,-.1,0\])

     rotate(\[0,90,90\])  

       cylinder(7,d=8)                      //lightening hole

   translate(\[0,0,0\]) //sphere(5);       

   rotate(\[0,90,90\]) 

       cylinder(5,d=25,center=true); //outer wheel

Am working thru OpenSCAD Tutorial. Got the streamlined car done. Unions, differences, and intersection went sort of OK. Things started to disappear. Made fancy wheel cylinder, inserted smaller cylinder (lightening hole) and wheel cylinder disappeared. Here’s code: $fa=1; //resolution command $fs=0.2; // surface resolution translate(\[10,-.1,0\]) rotate(\[0,90,90\]) cylinder(7,d=8) //lightening hole translate(\[0,0,0\]) //sphere(5); rotate(\[0,90,90\]) cylinder(5,d=25,center=true); //outer wheel Please advise soonest and thanks for being here, Jon

     translate(\[10,-.1,0\])

      rotate(\[0,90,90\])  

        cylinder(7,d=8)                      //lightening hole

Roger. 

On Fri, Sep 11, 2026 at 02:09:21AM +0000, Jon S via Discuss wrote: > $fa=1; //resolution command > > $fs=0.2; // surface resolution > > translate(\[10,-.1,0\]) > > rotate(\[0,90,90\]) > > cylinder(7,d=8) //lightening hole My openscad says: WARNING: module cylinder() does not support child modules in file testosc.scad, line 9 I suspect you intended to place a semicolon at the end here. Roger. -- ** R.E.Wolff@BitWizard.nl ** https://www.BitWizard.nl/ ** +31-15-2049110 ** ** Verl. Spiegelmakerstraat 37 2645 LZ Delfgauw, The Netherlands. ** KVK: 27239233 ** f equals m times a. When your f is steady, and your m is going down your a** is going up. -- Chris Hadfield about flying up the space shuttle. ** 'a' for accelleration.

Thanks, I think I see. Found Charles Wheezer on U-tube, 27 videos on Open SCAD. Easy to follow and listen to. I have another problem I’ll start another thread for. Thanks again. JS