This instructable is most relevant to models that are downloaded from thingiverse.com after using the customizer app to adjust font settings and custom lettering choices.
After several test prints I chose an easier to read font and increased the font size to improve readability.
The image shows the part of the text that reads d-a-d-d-y
TIP: A standard font is easier to read for most users.
I made it at Techshop http://techshop.ws with a Type A Machines Series 1 3D Printer
Submitted by SFlettering for the Instructables Sponsorship Program
Step 1: Starting the Print Right for Custom Lettering and Font Selection for Best Quality
When you start your print expect that your ring which is usually a perfect circle will have some areas missing PLA on the first few layers if it includes text. Many times the font selection has letters that are too large and run off the edge of the model creating early layers that may not stick to the print surface correctly because of the gap on the first layer.
Note: A z-height that is too low can ruin the letters and decrease readability
Step 2: Font Selection Criteria and Planning for Success
1) font size
2) font choice
3) font spacing
the results are that the bottom few layers are
1) solid circles
2) the text does not go off the edge of the ring
3) the top surface and final layers are complete circles
4) the letters can be read from a normal distance
TIP: 3D Printing custom letters regardless of the font can produce sharp edges.
Step 3: Z Height Adjustment for Best Results When Printing Text
TIP: Careful z-height settings are best achieved by always using the same exact paper when adjusting the settings.
Step 4: Bad Z-Height Can Equal Lifting From PLA
1) a dirty print surface
2) a gap in the tape
3) an uneven print surface
TIP: Do not allow a print to continue that lifts from the print surface as the quality will be very low and layers will easily come apart if it even finishes printing without the nozzle pushing the printed model out of alignment between layers.
Step 5: Final Print of Ring With Fancy Text - a Bit Hard to Read at This Size
Fancy text was hard to read when printed in a negative fashion where the letters are the missing space although I had better results when printing text raised above the edge of the print.
Printing onto a larger surface such as a bracelet also improved the appearance of the selected font.
The text can be read if you zoom in, but a typical person will not be viewing the ring from a few inches away and it needs to be readable from a few feet away.
TIP: Practice printing a few times with different custom font settings when using the thingiverse customizer app for best results.