This is the spool cover for a Toro string trimmer.  My trimmer is a model 51486 (24 Volt lithium) but I have seen a lot with this same cover.  If yours looks similar, give this a try and let me know in the comments if it works for you.

It's easy to print and I included the gcode for printing on an MK3s with PETG.

I used the following when printing:

• 0.2 layer height
• 4 Perimeters
• 15% infill

I used support material only for the overhangs on the tabs and selected “support on build plate only”.

The Fusion 360 design file is also included just incase you want to modify or improve it. If you do make improvements, then let me know in the comments.