elective laser sintering (SLS) is one of the mainstream 3D printing technologies. A major challenge for SLS technology is the lack of novel polymer powder materials with improved Z-direction strength. Herein, dynamic polymers were utilized to solve the challenge of SLS. To verify this concept, two types of novel cross-linked polymer elastomers, poly(bromophenol-urethane) (PBP-PU) and poly(pyrazole-urea-dimethylsiloxane) (PYU-PDMS), containing dynamic halogenated bisphenol carbamate bond and pyrazole urea bond were examined. The obtained PBP-PU and PYU-PDMS both exhibited excellent mechanical strength and self-healing efficiency, in addition to SLS processing ability. Small molecule model studies confirmed the dynamic reversible characteristics of dynamic bonds: chlorinated bisphenol carbamate dissociates into isocyanate and hydroxyl at 120 °C and reforms at 80 °C, pyrazole urea bond dissociates into isocyanate and pyrazolamine and reforms rapidly at 110 °C. SLS 3D printing using the self-made healable PBP-PU and PYU-PDMS powders was successfully realized. The interface interaction between the adjacent SLS layers can be significantly improved via dynamic chemical bond linking instead of traditional physical entanglement. The printed samples exhibited improved Z-direction strength, exhibiting nearly isotropic mechanical properties.