Hello everyone, i'm new in CNC. i just bought from Openbuilds Poland OX CNC 1000x1000 with Makita router. i'm trying to make it working. it was assmbly by them and now i'm doing first cuts. i'm using CamBam and GRBL for controling cnc. Everything is ok if i'm cutting squers but when i want to cut something in shape like letter "H" i'm getting strange behaviour. You can see this in attached example. External dimensions are ok but cnc is doing strange thing in two places. Hole element has 30mm by 40mm and cnc cut this perfect. All other inside cuts should has 10mm but two of them has 9mm and two 11mm. CNC is doing this always, it doesn't matter how many passes it is doing to cut hole material. (plywood). i'm adding picture of of result and projekt from cambam and nc file. Do any of you have any idea what can it be? when i'm searching for OX youtube woodworking with this machine i can see that it can make very good cutting but my it is not, i hope yet.