Summary

Convert an Ikea dresser drawer into a stylish dog bed!

Instructions

In addition to the drawer and hardware included you will need:

6x M3x8mm machine screws
Woodworking tools capable of a rip cut and a curve.
Metric tap and dye set
Hand drill w/ 1/8" all purpose drill bit.
Sandpaper: 80-120, 150 grit
2x nails or pins
1x length of cord or string, twice as long as your longest board just to be safe
1x Pencil, sharpened
Eye protection for all participants
Ear protection for all participants
Paint or wood stain, drop cloth, brushes, etc...

Remove rails from drawer, retain mounting screws.
Disassemble drawer, retain all hardware.
Using back panel as a template, rip cut front panel bottom edge such that there remains an equal distance from the edge to the dado in which the floor rests. Course sand ripped surface with 80-120 grit sandpaper.
Scribe a half-ellipse on back panel top edge. I find the gardeners ellipse to be expedient and precise. The equation you want is
f^2 = a^2 - b^2
where a = semi-major axis, b = semi-minor axis, and f = linear eccentricity, in other words the distance from the origin to each of the foci.
Cut out the half-ellipse using a jig saw or similar method. Course sand cut surface with 80-120 grit sandpaper.
Reassemble all but the floor using retained hardware. Finish sand all surfaces with 150 grit, then 120 grit sandpaper. Stain/paint as desired.
Print 4x feet and 6x supports. I used:
PLA
.4mm nozzle
.2mm layer height
no support
50% infil

For the supports concentric top, bottom, and infil workout out great with every 5th layer solid. The feet were rectilinear top and bottom with honeycomb infil, every 5th layer solid.

Clean out screw bores in supports with a small drill bit, then tapped out M3 threads.

NOTE: if you do not have a suitable tap and dye set you will want to alter the support design by increasing the radius of the bore to closer match your screws. The STL provided has a 2.5mm diameter bore. Alternately you could simply drill out the bores I suppose.

Use the rule of thirds to mark four evenly spaced intersections on drawer floor. Mark two additional points on the short-side centerline about one-third of the way from the edge to the first set of marks (i.e. ~1/9th of the long axis in.) Drill at marks to accomodate screws.
Once paint has dried, slide floor into dados, secure with printed feet and screws from rails. Install a support at each drilled hole in floor with M3x8mm screw.
Cushion construction beyond the scope of this tutorial, but basically pick fabric, pre-wash and iron, cut two rectangles with edges sized 1/2 the perimeter of respective enclosed plane plus 1/2" for seam. Place outer faces together, straight-stitch 1/4" seam around, leave a gap to invert and stuff. Turn inside out through gap, pack with poly-fill to desired level, pin remaining seam in, whip stitch gap. Check, roger.

Ikea Dresser Drawer Dog Bed Retrofit