# Too complex for constraints?
**URL:** https://discourse.shapr3d.com/t/too-complex-for-constraints/21605
**Category:** Modeling Questions
**Created:** [September 27, 2022, 12:17pm UTC](https://discourse.shapr3d.com/t/too-complex-for-constraints/21605 "2022-09-27T12:17:18Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@piciu](https://discourse.shapr3d.com/u/piciu)
#### Post date: [September 27, 2022, 12:17pm UTC](https://discourse.shapr3d.com/t/too-complex-for-constraints/21605/1 "2022-09-27T12:17:19Z")
Hi !
I have a sketch. I want it to make resizeable.
It,s like on the picture.
I wanted to make it possible to make it available for future modification like: extending it up, or extending it t sides (maintaining the same round edges, and sime 10mm space between outer lines of this object.
I tried puting
- parallel constraint with
- perpendicular angles, with
- tangents between archs and lines (not all are possible to apply
- horiz / verticval
- equaities for the lines
I tried all of them when possible, or some of them.
But this model either doesnt work whn I move one of the dots to extend line, or sometimes it worked and then stopped.It’s strange.
Sometimes I see that after some modifications line ends go and missalign to some archs. (from far it shows doble dot, but when I zoom in extremly near I see that line actually ends 0,002-3 mm too far.
Sometimes the angle changes to 89,9991 degr.
Any clues ?
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### Author:  [@piciu](https://discourse.shapr3d.com/u/piciu)
#### Post date: [September 27, 2022, 12:41pm UTC](https://discourse.shapr3d.com/t/too-complex-for-constraints/21605/2 "2022-09-27T12:41:56Z")
Ok, I gave it one more (th) time. And seems It works now.
I constrained (Arch angles, Arch sizes, space between lines to 10mm, made all lines horiz/vertical). Now by druging line left right, up down. The whole model adjusts itself…
Huuh.
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### Author:  [@Loki](https://discourse.shapr3d.com/u/Loki)
#### Post date: [September 27, 2022, 1:23pm UTC](https://discourse.shapr3d.com/t/too-complex-for-constraints/21605/3 "2022-09-27T13:23:46Z")
Pay very close attention to grid size and lock it when doing extremely precise alignments. Use tangency more often. H/V constraints are not always necessary.
This way, you can zoom in and out without having to worry about grid size acting all silly.
More seriously: from what I see, I can tell that you should focus on locked/unlocked parts as well as connected/disconnected parts of your sketch.
Locking a few points prevents them to move when they don’t have to, but locking whole lines, arcs, circles and splines is too much.
Having parts connected without a ton of constraints gives you a lot of flexibility over the shape, no matter if you need to resize or modify in any other way. Oh, and offsets almost always behave unlike the original sketch …
It’s my old CAD guy opinion, and you should ask others. Maybe move this to another forum section with more visibility?
Meanwhile, you can refresh your sketching skills. Here’s a cool workshop (check out official “constraints 1” and “constraints 2” video series as well) to help you:
[ ](https://www.youtube.com/watch?v=pjXaCc52N5w)