I want to share with you this page i found on internet for printing readinnes. At preschool my grandson had for homework to trace and write number 3. I can see that he is not liking very much this activity and is taking too long. So i look for help on the web and found this free pages.
There are many exercises starting form straight lines to circles.
Maybe it is also usefull to you.
http://donnayoung.org/penmanship/redines.htm