Bowflex Selecttech 552 Caster Wheel Feet

This model is for Bowflex Selecttech 552 Dumbells with the plastic molded base. It allows you to add 7/16 inch diameter Grip Ring Stem Caster wheels with a length (for the stem) of at least 1-3/8 inches. The product I used is RILIDRI 2-Inch Swivel Stem Caster, 7/16-Inch Stem Diameter Rubber Wheel, Thermoplastic Rubber - 4 Pack(2 Brakes 2 Swivel) from Amazon.com. They slid in with a nice, tight fit but can still be removed with a bit of effort (bracing one hand/arm to hold the plastic base/foot and one hand pulling/twisting the stem and wheel) and won't damage the foot when removing; just pull straight out. The wheels I used were 2 inch rubber grip ring stem caster wheels, and they don't damage flooring at all (I have cheap faux wood flooring - no issues at all). The total height of these particular wheels, the plastic base, and the dumbells combined comes in right at/just under 12 inches, and the whole thing rolls super smoothly with rubber caster wheels. 

IMPORTANT: The feet are designed to be secured to the plastic base by using the original screws, metal washers, and rubber feet.

Printing Guidelines:

• USE THE BRIM feature (outer and inner).
  • You may need to play with the gap between the brim and the parts a little, depending on how easily you want the brim to peel off.
    • I used a 0.05mm gap on my prints, since 0.1mm didn't quite hold one corner down for some reason. It created a bit of a more snug brim, so I adjusted the print setting to 0.07mm. Feel free to adjust as needed.
• All other print settings should be set up correctly and shouldn't need adjustments. If you feel the need to adjust the infill %, just keep in mind that, the lower the % infill, the weaker the structure will be, and this could lead to part failure under the weight of the weights. The total weight of each dumbbell is around 54 lbs (with the base), so each wheel is holding up about 13-14 lbs. 
• I used PLA basic, but you could potentially use PETG or another material as well.

NOTE: When printing with PETG on a different model/design, I noticed issues with corners and thin spots peeling up when printing with PETG. If you decide to print with PETG, you can adjust the Start gcode to lower the chamber fan speed by using the following code. Make sure to remove the start/end quotation marks - just there to quote the code.

; filament start gcode
{if  (bed_temperature[current_extruder] >55)||(bed_temperature_initial_layer[current_extruder] >55)}M106 P3 S200
{elsif(bed_temperature[current_extruder] >50)||(bed_temperature_initial_layer[current_extruder] >50)}M106 P3 S150
{elsif(bed_temperature[current_extruder] >45)||(bed_temperature_initial_layer[current_extruder] >45)}M106 P3 S50
{endif}
M142 P1 R35 S40
{if activate_air_filtration[current_extruder] && support_air_filtration}
M106 P3 S{during_print_exhaust_fan_speed_num[current_extruder]} 
{endif}

IMPORTANT: If you are printing in PLA and your cooling settings are different than what is in the .3mf file, it may be helpful to turn off your Auxiliary fan, as the part fan should be sufficient for cooling PLA while not cooling the parts too much, which would lead to warping/pulling up in spots. This is just more of a helpful hint for PLA printing in general, not necessarily limited to this model. I recently adjusted my cooling settings after noticing issues with warping or spaghettification, especially with thin areas or if printing with higher infill settings.

NOTE: This design is based off the design by BRUCKERM on Cults3D (🛞 Wheel Foot for Bowflex SelectTech 552 Dumbbells・Free STL File for ・Cults). While I liked the design, I really wanted a design that allowed for greater movement, so I modified the design to allow for caster wheels. If you would prefer to save money and just print all needed parts using 3D printer filament (instead of buying caster wheels), BRUCKERM's design is a great option. I have attached an image of BRUCKERM's design below.

Note: If you decide to make changes to the model in a 3D modeling program via importing .STL file into that program, please note that the model is only for 2 of the 4 feet/bases. You will need to mirror the model along the X-axis in whatever 3D printing software you use to print models for the other two feet. This NOTE only applies if you are importing the .STL file into a 3D printing program, rather than just printing via the .3mf file. The .3mf file already has the part mirrored, a support blocker added to the stem caster shaft hole, and all print settings optimized.