DRAWORDER, OVERKILL, REVERSE and FLATTEN

Set the stacking order (DRAWORDER), delete duplicate objects (OVERKILL), reverse line direction (REVERSE) and set Z to zero (FLATTEN).

What it does

Command	Alias	Syntax	Meaning
DRAWORDER	`DR`	`DRAWORDER <Front\|Back>`	Moves the selected objects to the front or to the back.
OVERKILL	`OV`	–	Deletes duplicate and overlapping lines in the whole drawing.
REVERSE	`REV`	–	Reverses the direction of the selected lines, polylines and splines. This matters for the cutting direction in G-code.
FLATTEN	–	–	Sets the Z value of every object to 0. It fixes snap and area problems caused by DWG files that have Z levels.

Where to find it

Ribbon: Draw › Modify › Trim ▾ › Bring to Front (DRAWORDER) / Send to Back (DRAWORDER)
Ribbon: Manage › Drawing Cleanup › Delete Duplicates (OVERKILL)

Steps for OVERKILL

Type OV and press Enter.
The result reads OVERKILL: removed 2 duplicate object(s) or no duplicates found.

Steps for DRAWORDER

Select the objects.
Type DR F (to the front) or DR B (to the back).

Note: Use TEXTTOFRONT to bring all text and dimensions to the front, and HATCHTOBACK to send all hatches to the back.

Try it: Mandala coaster without double cuts

A 90 mm mandala coaster for the laser. If the same petal is copied twice, the laser cuts it twice and scorches the wood. OVERKILL finds those hidden duplicates and deletes them.

Coaster: C, 0,0, 45, Esc. Centre: C, 0,0, 8, Esc. Petal: C, 0,24, 12, Esc. Dot: C, 0,38, 3, Esc.
Click the petal, Ctrl+click the dot, type ARRAYPOLAR 8 and then 0,0. Eight overlapping petals form the flower.
Now make the classic mistake: click the first petal, Ctrl+click its dot again, and run ARRAYPOLAR 8, 0,0 once more. Nothing looks different, but 14 extra circles now sit exactly on top of the others.
Type OV and press Enter. The result reads OVERKILL: removed 14 duplicate object(s).

Challenge: Run OV again. This time it reports that there are no duplicates, so the file is safe to send to the laser.